The dev profile serves double duty:

• faster iteration time
• debugger support

These come into conflict with some settings for debuggers slowing down builds, with potential changes to values like

• debug
• opt-level

See also

• Discussion of defaults settings for build dependencies for fastest compile times #10481
• https://blog.rust-lang.org/inside-rust/2024/12/13/this-development-cycle-in-cargo-1.84/#improving-the-built-in-profiles
• https://internals.rust-lang.org/t/feedback-request-performance-improvements-from-reducing-debug-info/21825
• #t-cargo > Effect of disabling debuginfo in the dev profile @ 💬
• #t-cargo > `-Csplit-debuginfo=unpacked` on Linux @ 💬
• https://blog.rust-lang.org/2024/02/19/2023-Rust-Annual-Survey-2023-results.html#challenges has build times and debugging as neck and neck
• https://mas.to/@davidlattimore/113484821980790635